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Photosynthesis Inhibitors

Paraquat (Herbicide):
  • Act by accepting electrons from the early acceptors of Photo system- I (PS-I)and then reacting with oxygen to form superoxide.
  • CMU-3-4’ chlorophenyl-1-1-dimethyl urea.
  • DCMU-3-3-4’ dichlorophenyl-1-1-dimethyl urea.
  • Non-cyclic photophosphorylation is inhibited by CMU& DCMU. Competing for the binding site of plastoquinone that is normally occupied by QB.

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